what i mean bye work at all is will i have meny probs,how much power would i loose. is it worth putting 350 heads on a 305 and if i did would i have to use 350 head gaskets (most likely)

im going to use it to drive on weekends and race freinds (its road legal) and maybe go to the local race way. My freinds keeps bragging his s10 with 305 will blow the doors of any thing around here so i built a car, my little 2 seeter rx7 that had a rotory motor so i replaced it with a 350 but its dieing so what would be a good and cheap way to get as much power out of 305 as i can while i rebuild the 350?