Block Selection and Bore and Lifter Spacing for New Motor (Hemi)

I will be starting a search for a clean, used block over the winter season. What are the best blocks and what lifter bore spacing for getting into newer Fat heads. I have a TFX 96 4.310 and 1.8 spacing now which apparently is limiting my head/pushrod options. My motor now and the new motor are/will be run in an outlaw class with a C rotor at 90 and 125 over.

I have heard that the TFX is the strongest, Brads are awesome. Looking for good pushrod tip oiling too, if that exists.

TIA
ScotttRod