The "512" kit (really 505" at .030 over with a 4.25 stroke) is really nice in that it drops into the block when you use the 2.20 Chevy rod journal. The closest point is the oil pump pickup boss. Usually okay with ~.060 clearance.
Not sure you need the extra cubes because all you are doing is moving the peak numbers the heads produce lower in the RPM range. You will have GOBS of torque with the 512. Mine makes 714 ft/lbs. At 3450 RPM with head numbers similar to the Trickflows.
Mine has a small hydraulic roller and it pulls hard to the 6400 rpm limiter.
'63 Dodge 330
11.19 @ 121 mph
Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs.
10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.
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