Do a search on your particular truck, and you will find all kinds of stuff; vendors for suspension parts, engine parts, etc. As for forums, I am new here, but it is very informative, and alot of people here seem to know their stuff.

As for the engine, good advice above. 1970 is a good year for performance (heads). I am more of a big block kinda guy, but have built a couple 302's. Seems all engines have a "weakest link", and this is only my opinion, but I think the first thing to look at when building a 302 is air flow, both intake and exhaust.

On the other hand, 302's do not need alot to make them respectable performers. They are pretty tough, and love to wind.

One more thing, and this is again my opinion, but to me the most important thing is the block during a rebuild. I could go on for an hour on this, but to make a long story short, have the block, crank, etc. checked, and make the needed repairs. I try to fund the worst case scenario; block needs .030" over, new pistons, crank needs turned. New rings, bearings, oil pump, and timing chain are automatic. Any funds left over after finding exactly what the engine needs can then be spent on performance parts.

Two reasons for this; One is that a chain is only as strong as it's weakest link. To bolt that new shiny intake on a ragged out engine will only lead to failure. I have seen guys put a 302 with 90K miles in a new Cobra replica, and I just dont understand it. The second reason is that after the block is taken care of, basically everything else can be bolted on later, without any major disassembly- i.e. carb, intake, ignition, heads, headers, etc. It might take awhile longer, but you'll have something that will run great and be reliable. Also, with doing things one at a time, you will see the effect of it.

Good luck, and hope this mumbling helps!
Greg