i pulled the casting #'s from the rear drivers side of this sb .#'s as follows 14010207 mortec site said it's a 80-85 350 /didnt pull valve covers yet/ my question to you is what comp ratio? 2ed is are the heads on this thing worth doing any thing to or should i look for a different set ? id like to up the comp ratio .is this possible with out changing pistons? i'm new to small blocks and it's been yrs since i put togather a big block what should i do ?