I built a 1970 Chevelle with a T-425 trans axle drive train with a 6-71 blown small block chevy adapted to the T-425. Remote oil filter and custom pan for the chevy engine was required.
I always ''rolled'' on the throttle with the FWD setup, not hammer it hard and shift the trans at WOT.
Although... the first time I shifted 1 - 2 under WOT , the drive chain broke apart, ripped holes in the chain cover.
The T-425 was modified for firm shifts and dual feed direct clutch just like it's brother the T-400
Yesterday is history.