Hi Larry,
Would Lump Porting have any advantage to a 292 (at least .030-over) running on propane in a 4x4 '67 Suburban? Highway/offroad applications.

I/I #4101
'71 GMC Jimmy 350, sm465, np205,3.73 posi.
'68 C/10 Stepside 292 (.030 over) Offy Intake, 500 CFM AFB,Clif headers, sm465, 3.73 posi.
'67 K/10 454 project.
'72 K/5 rolling frame project.