Best is cam and stall. Changing to those heads might net 8-10hp.
Cam
good timing chain
good springs
Good Stall
underdrive pulley
160 t-stat
oil pump
ported tb
good injectors are for longivity
good= quality parts, get what you pay for.
we get a few cars a year that have mismatched parts or put together badly. By the time we fix them or adjust everything correctly it would of been cheaper if they just had us build it. Some cars come in perfect.
So, make sure your confident to do the job correctly first.
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