Okay, A while ago i bought a '79 gmc suburban with a 454 that I took out (trashed the suburb) and put happily into my '69 nova. Recently I started to upgrade the thing and realized how important it is to know whats in the block already!

I found the casting numbers and casting date, but this is the best info I can findon it:

361959.....454.......73-90...2 or 4 bolt

... that really tells me nothing! Casting date is F29 78 (june 29th, 1978). I already figured its not a tall deck, and I know it has peanut oval port heads, I would really like to know if it is 2 or 4 bolt.

Most of the other casting ID sites I have looked up just say its either a passenger car eng, or a light truck eng (which would make sense).

Can anyone help me with this?