I'll assume with the 3500 stall it will be a milder build, anything 200 cc to 220 would work fine, if you go with the bigger cubes up to 230 cc. Darts are really good as cast, minor bowl cleanup and a good valve job they will work very well. Keep your @ .050 duration on the intake to around 240˚ to work with your converter, a little more with the 427 is OK. Super Victor and an 850 DP or 1000HP. I ran an 8.59 in my old dragster with a 406, roller cam, 200cc Iron Darts, Super Victor, and an 800DP.