1970 C10 rwd LWB budget parts find?

[Mala Suerte]

I'm sure this question has been asked a million times....
Do any later model 1970+ GM vehicle parts fit?
I need front disc brakes , brake booster etc and was hoping to find me a parts car. I have acces to late 80's 90's 00's Saturn, Astro vans, Buicks etc.

I also want to relocate my gas tank from behind seat to under bed. What conversion has worked for you guys?

Any ideas or suggestions will be greatly appreciated. Thanks in advance
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