I've got a 350 thats 30 over with crank and 194/202 heads, all of which need to be rebuilt. Was thinking of doing the 383 crank with an RV cam. I am going to have to take the block 40 over do to the amount of rust from sitting exposed to the elements. Anybody got any ideas "how much more" of a difference am I going to be able to notice from a stock 350? Don't you buy no ugly truck!