72duster72 -
Here's my post from July about another option using the GM 200-4R rather than the 700R4:
I've been thinking about a 200-4R behind a 360 magnum crate motor in a '69 Dart for the past week or so. Talked to several tranny companies about it and finally contacted Art Carr at California Performance Transmissions last week. He estimates total cost including converter and installation at about $3300. This does not include a new 8" longer driveshaft since the 200-4R is 8" shorter than a 727. It's also lighter and doesn't have as much HP loss through the transmission. The gear ratios are better than the 727 and it does not require trans tunnel surgery to fit. Art says he has a customer in PA with one behind a 406 stroker that runs 11.80s and still pulls down 25 mpg on the freeway.
Somebody tell me something bad about this setup......
I never did get any negative response to this idea other than the expected 'GM tranny in a Mopar' negative comments. I'm still thinking about this but haven't pulled the trigger yet since a couple of things have put my '69 Dart build on the back burner for a while.