I need a little help choosing a custom hydraulic roller for my .040" over, 4" crank, 340 street/strip engine. Here's the basics:
Callies forged crank, Eagle H-beams, Diamond 23cc dished pistons, ported Edelbrock RPM heads with sleeved push rod pinch and head bolt bulge (not sure of flow #s yet), Edelbrock Air Gap intake, port matched and a holley 950 street HP carb. Block is zero decked with .040" quench and a true 10.5 to 1 compression. This engine will breath through 1 7/8" TTI headers and a 2.5" exhaust with X-pipe and dumps. I have 1.6 to 1 Harland Sharp rockers and new Hughes hydraulic roller lifters. The engine is going into my barebones, 4 speed, 1972 cuda with a 4.10 8 3/4 rear and 275 60R-15 tires.

I've decide on Comp Cams XFI lobes; lobe #3018 on the intake, which is .242 @ .050 and .584" lift with the 1.6 rockers. My dilemma is choosing between a straight or split pattern, lobe# 3038 .242 @ .050 with .576" lift or lobe# 3039 .248 @ .050 with .579" lift, on the exhaust. I do not care about idle quality or vacuum.

Also, I want a tight LSA: 106, 107 or 108 degrees??

Sorry for the long post, just wanted to give all the info.
Thanks!!