I have always used just the tin itself with cast iron heads with cast iron intake, aluminum intake and aluminum heads with aluminum intake. I did have to "port" the tin to match the cnc port work of my stealths. I use a little Permatex Right Stuff around each port. Never an issue....other than when my dumb a$$ torqued it down with the oil pressure wire under it! LOL!
'63 Dodge 330
11.19 @ 121 mph
Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs.
10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.
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