to the OP the pacifica is a great guitar, but if the basic model it can come not amazingly set up. You might want to measure the height of the pickups from the strings and compare to the yamaha service manual recommendations. If your guitar is always sounding thin no matter what you do it can be due to the pickups being set too low. Equally don't raise them too high or it things get bad quite quickly - youtube has lots of videos of the problems either way.
To get a shadows tone on a budget you want tremolo and a bit of reverb, possibly a touch of delay. I own these and they are great mini-pedals and very budget friendly (as guitar pedals go):
Donner Golden Tremolo
Donner Yellow Fall (adjust to one repeat approx 0.25-0.5 seconds after the strike)
Mooer Shim Verb (use on spring setting)
Donner incredible V amp and cab sim
You can go straight from the V into a PA/interface if you want to. The tone is quite reasonable for a budget set up. I'd be amazed if you can't tweak those to give you a very good shadows tone.
Basically it is the tremolo and (occasional) slap-back echo (1 repeat) that will get you there. Then a bit of reverb and an amp+cab sim to broaden the sound and job done. Clean soloing nailed. The incredible V will also give you a reasonable overdrive too. Trick is to balance the gain with the volume on your guitar so you start to get breakup at 7 on your volume dial when you are playing very heavy, or at 10 when you're playing lightly, then roll back the volume so it is clean under normal playing. the aim is to keep it at, or just below, the point of breakup then you can dig in for crunch or play light for clean. Same applies for your amp settings. Never just dial the overdrive to max. It's all about balanceand you want it to respond to your dynamics. Distortion is a different beast but trust me if you're after the Hank Marvin/Shadows' tone you won't want to be playing with distortion.
To get a shadows tone on a budget you want tremolo and a bit of reverb, possibly a touch of delay. I own these and they are great mini-pedals and very budget friendly (as guitar pedals go):
Donner Golden Tremolo
Donner Yellow Fall (adjust to one repeat approx 0.25-0.5 seconds after the strike)
Mooer Shim Verb (use on spring setting)
Donner incredible V amp and cab sim
You can go straight from the V into a PA/interface if you want to. The tone is quite reasonable for a budget set up. I'd be amazed if you can't tweak those to give you a very good shadows tone.
Basically it is the tremolo and (occasional) slap-back echo (1 repeat) that will get you there. Then a bit of reverb and an amp+cab sim to broaden the sound and job done. Clean soloing nailed. The incredible V will also give you a reasonable overdrive too. Trick is to balance the gain with the volume on your guitar so you start to get breakup at 7 on your volume dial when you are playing very heavy, or at 10 when you're playing lightly, then roll back the volume so it is clean under normal playing. the aim is to keep it at, or just below, the point of breakup then you can dig in for crunch or play light for clean. Same applies for your amp settings. Never just dial the overdrive to max. It's all about balanceand you want it to respond to your dynamics. Distortion is a different beast but trust me if you're after the Hank Marvin/Shadows' tone you won't want to be playing with distortion.