To do it with factory parts, you will need the V8 frame mounts, cylinder style motor mounts, and BB engne mounts (cans) which are differ ent than the SB ones. You will also need an early oil pan. I'm assuming you will be updating the transmission also which will require modifying the crossmember.
The frame monts look like this
1957 Plymouth (Hemi, Dual Quads, A833 4 Speed 9 1/4 w 4.10) Sold
1937 Dodge Pickup (Hemi, 6X2 intake, 46RH, Dana 60 w 4.56) Sold
1968 Plymouth Valiant 2dr sedan (354 HEMI, 46RH w/4.30 gears) under construction
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