Thanks for the info everyone. I put the motor in late last week for a test fitting and to locate the transmission cross-member. Im also setting up the tilt column, pedals, and brake booster and realized that free space was rapidly diminishing. I think I'll be putting an aluminum radiator behind the grill to save on space.

'58 Apache: Camaro sub, 383 w/forced induction, 700R4 trans, 4-link w/floating 9" and un-altered sheetmetal.