i have no clue man i never looked at it close could have been some poor ingenuinityi didnt think about that.we might have a mid 80's chevy cab/chassis from the local vfd. its got a 454 in it right now, i thought they were somewhat close in size
i'm not too worried about fitting. if nothing else we'll drink a little and fire up the torch. I dont guess you happen to know which trans will fit behind them that are sturdy