As mentioned the biggest thing against you with the small bore long stroke is the lack of compression. Not many off the shelf pistons are available, most are for 108cc chambers and with custom pistons $$ the dome is so big, with the 115 cc head, that the flame travel suffers..
I would sell the 396 block. Or have it sonic checked and if good bore it to 4.250" and use standard bore pistons for 427-489 depending on stroke. Some 396 blocks also will have to be clearanced for 454+ cubes.
Budget build would be 427 bore, 396/427 crank with old L-88 style pistons. This combination works well with a .660" cam, not hard on internal parts. Revs like a small block.
I built one last june for one of the guys that works in my shop. He had a lot of fun $$ breaking the 7.5" Camaro drivetrain stuff..
Next year he will have better parts underneath..