I replaced my clapped out 305 with a base 350 crate engine. I put an Edelbrock Performer intake and a Performer 1403 carburetor on it,, along with a standard HEI distributor. I am still fine tuning the jetting on the carburetor but I can honestly say this was a HUGE improvement over my tired 305.
My truck is actually fun to drive now. I probably have $2,000 in the whole job and I would highly recommend it to anyone who is looking to upgrade the performance of their truck. I look forward to driving it for a long time to come!