Forget the 700R4, not many will live for a long time in a high torque application. They are not too fond of 6,500+ rpm either. The 700R4 has several design issues, some of which are worsened when using a lock up torque converter. I only know of one guy who has reliably made it into the mid 11's with a 700R4 (not a big block), and he rebuilds his every few hundred runs. EVERYONE, and I mean EVERYONE else that I know just blows them up.
Thanks to the dedicated (some would say rabid) Buick Grand National Turbo enthusiasts a good, but often overlooked, overdrive trans can be built. Notice I said built, because in stock form the 200 4R trans is perhaps a bit weaker than a stock 700R4 - but fortunately the 200 4R does not suffer from the design issues of the 700R4.
Check out http://members.rogers.com/roguevette/
he is using the same trans (minus the trans brake), built by the same guy, that I am putting behind my supercharged big block. And since he runs 9.7's at 142 mph, I'm pretty sure you would have great reliability in your far milder combo.
"Bomber" '67 El Camino, Beater comes back to life.
Was 350/TH350 14.90 @ 93mph, 360,000+ miles on car.
Now 406 roller, 340rwhp, more hp coming, 3.08 gears.
Street radials, left in drive, 13.20 [email protected]
8/1/01 added Plum Mist '67 to collection
ProCharger D-2R 468 under construction.