It's very common to use bolts with nuts on the lower mount location when using a car transmission.
A car bellhousing would be a step in the wrong direction as the bellhousing to crossmember
mounts are different.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine