Whats the cheapest mods i can get done to get some good power gains out of my 350 tpi?

anything

 

K&N Air Filters and a cat back exhaust system for starters. You can install the filters but most shops can install the exhaust system for $50-100 if you're not up to the challenge of cutting off old corroded pipes and replacing them yourself.

The mind boggling choice now is WHICH CAT-BACK SYSTEM?...RIGHT? I suggest the Hooker Cat-Back because I have my opinion just like everyone does.

Good tires matched with an aftermarket torque converter is a very worthwhile modification also if you're looking for better acceleration in a "drag racing" situation.

Do a search with the search feature near the top of the page here and you'll find tons of info on basic mods for starters and everything else.

 

Judging by your previous post, why don't you find out what you have FIRST before you start asking for mods Someone else swapped in an engine with misc bolt ons. It would be nice to know whats already done...