If you are going to use the stock front mounts and the stock type bellhousing with the mount pads on the cross member a Large Cap HEI will not clear the firewall without some serious modification. (Such as a BFH). The stock type bellhousing uses the 3 bolt starter. I have seen some that use the block mounted starter by removing part of the lower starter mount area on the bellhousing.
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