Guys I am gathering parts for my BBC build. Its a 454 .030 over block. 10:1 compression. Intake is an Edelbrock RPM air gap. Have not purchased/decided on a carb as of yet. Trans is a TH400 and will have approx 3200 stall. Rear gear 3.73. Car is a 66 Chevelle and will be 90% street and is not a daily driver.

Heads are GM 049 castings that have had port work and 2.19/1.88 Ss vavles installed by a reputable builder. Flow sheet was provided with heads and reads as follows:

28" 4.350 Bore

Good Port Bad Port
2 162 2 162
3 228 3 222
4 286 4 270
5 311 5 302
5.5 313 5.5 311
6 313 6 318

I have not decided on a cam as of yet but Im leaning heavily towards a hydraulic roller camshaft. My question is how much split should I look to utilize in a cam I choose? I hope I have provided enough information for some insight/advice.

Thanks for any replies in advance,
Scott