thinking np203 trans case a bit of work but like the full time 4x4 not woried about miles per gallon i look at it as smiles per gallon if yor getting double digets your doin good
head gasket chose sbc
sbc 350 30 over enginetech pistons ex262 comp cam edelbrook 5089 heads proformer intake qjet
373 gearing 33/12.5 tires in a 1978k10 with a th350 and np203 trans case
gasket .015 or .040