Will 396 fit in 61 with 84 X-mbr?

[Branman1971]

I am getting ready to drop my 396 into the frame of my 61, which has a 1984 front crossmember for the disc brakes and PS option. I have seen where folks are dropping big blocks in their trucks and cutting the frames and the firewalls to fit the BB but I was wondering if anyone made it fit with the newer crossmember like I have done. I also installed the 1984 engine perches that held a 350 SB, and I think I read that those will not fit under a 396. Is that correct? Anyways, If the motor hits at the firewall I will most likely slide the thing forward. Thanks for any input!