I keep hearing that the crossmember has holes for the th400 crossmember but on mine I only see the holes that the powerglide is bolted to is there a difference between the subframe in a nova and a ventura

TH 400 was only installed behind a BBC. So because the BBC was offset to the passenger side the holes are different than any SBC application. The TH400 transmission crossmember was also unique in that it has one round corner in an otherwise square hole in the member to mount the rubber bushing. The Power Gulide crossmember should be the same as the TH350. Sent you a PM with the June 1991 Super Chevy Article outlining all of the changes and part numbers with pictures of each part to put a BBC in a F-body or X-body car that had a SBC before.

Big Dave

thanks for the PM Dave it helped alot some of my questions were answered so I dont have to keep bugging you guys for info thats already been posted I'm going to have to print that out and put it into my build journal thanks again Dave