I just used the high temp copper RTV on both sides of my intake gasket. I don't think it's leaked, but then again I haven't done a paper check. I haven't noticed any popping like my 327 did when the header gaskets blew on it. I'm using the stock bolts and clamps except for the end ones. Basically it's the same setup as yours.

I was also wondering if you had tried the throttle brackets that have a built in base? I think everyone makes them. It actually bolts under the carb just like a spacer, but it has an arm coming out that the throttle cable attaches to. Thanks. John

'68 C-10 - 250 with Edelbrock 600cfm 4 barrel, Offy intake, Hedman headers and true duals, HEI, MSD 6A box, relocated gas tank
Soon to have: T-5 tranny