400 low buck dont give a

I had an identical motor to what your proposing in my 68 Road Runner with a 727 and a 3.55 rear. The short block was an NOS crate motor from Mopar and I put refreshed unported 906s on it with a TM6 and a 750 DP. It had a 2200 stall and the car was fully restored on BFG radial T/As. It ran a best of 12.56 at 107. It had 7.9 to 1 compression and a 509 cam. Everyone told me it would be a pig and oddly enough it would barely spin the tires but it hooked and booked. So if a mid 12 second car is a pig then I guess it was a pig. lol.