You could always build a 455 HO for your 70 as there was a 455 HO D port engine that put out 370hp with 450 lbs TQ. @4200. All of those engines are 4 bolt main engines to. Also there was a few 70 that have a 455 with the Ram Air IV heads on them put together in dealerships because the Ram Air IV short bolt wasn't any left or ready at the time when a customer had blowen his IV car up so they would put in a 455 bottom end for an ccar which had bigger displacement but also had the required 4 blt bottom end. I know of one that was at the GTOAA meet in 1988, an original owner car with ALL the parer work showing why it had a 455 with the IV heads. And for nicks67 your correct you must not know alot about the Judges but hang in there we were all once blind but with time & trial we all learn about our favorite brand of car,,,PONTIAC.
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