I have to go with the tried and true 350+.030 (355) but with an OD transmission in today's uncertain economic world for ease of sale. You'll get more potential buyers with cash in their pockets then tire kickers who just wont have enough more bucks in their pockets to go the big block direction. One - two years ago I would have gone the BBC with all possible, but not now.

The right Resale Red will IMO help move it (with a bit of sparklie stuff in it ) quick