I found changing to studs on some key boltholes helped. [Esp. the ones the intake hangs on.] Also replaced all my 25+ Y.O. hardware with new grade 8. I used a thick Clifford gasket and sprayed both sides with Permatex Copper-Spray-A-Gasket. After that dried I ran up a bead of Ultra Copper RTV on all the openings. I let it dry 24 hours before firing up. Good luck.
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.
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