First off the car I am building is an 80 el camino. I currently am running the nearly stock 305. It currently has a edlebrock 650(to much) on it. I have added knn air cleaner,full length headers to(3in) into 2.5 true duals dumped after flomasters just before reared. Th350 reared currently. My dilemma is I want to upgrade all drivetrain soon. I want around 400hp/tq, 4 speed, and to upgrade reared. I am on a budget and looking for the best combo. I have an old 4 bolt main 350 and possibly a 200r4 to upgrade and build, or go with a new transmission(jegs) and sbc from blueprint(carb) my other option is getting a ls based truck engine from justchevytrucks.com and transmission and doing all the mods and changing headers to make that work. I know the ls option is more work. I don't know if the stock 7.5 would be worth building. I want to go 3.73 and limited slip or posi. I would love the 9in you can buy but either way the g body reared seems expensive. What are your thoughts? I am in Texas and want ac. I have gone back and forth and researched until I'm blue in the face. Someone win me over on budget and performance.