Thanks, the number on the drivers side pan rail is PK443155493486436
Anyone know how the figure what the 904 was in originally using that number?
I sure as hell don't
Checked my chart and it stops at 441xxxx and those were 86 transmissions. Are you sure you got the #'s correct? If so it's newer than 86. Do the input shaft splines go all the way to the end of the shaft or does it have about 1/2" of the front end machined down smooth? If it is machined smooth it's a lockup trans. Here's a picture showing both. The top picture is of a lockup shaft. I should also note that converters don't interchange between lockup and non-lockup.
Sorry to bust your bubble but there's absolutely no possible way it'll make anywhere close to 400 hp. Cam is wayyyyyyy too small, intake and heads won't flow enough air. Maybe 300 hp tops and that's pushing it. If you stop and think of it what you have is a small cubic inch version of a 340 with small valves in the heads. 70 340's were only rated at 275 hp. Not saying it won't be a decent running engine. Just not anywhere close to 400 hp