Bolt the intake and the exhaust manifold together have them milled or surfaced as a pair,bolted together. Then go and buy some ARP oil pan studs for a Pontiac v8 389 or whatever those have a rounded head fine threads and corse threads where they screw into the head... they will be fullproof clamp and never break off and you don't have to worry about this 50-year-old brass crap or nuts freezing to studs and breaking off in the head 'which is what happens after a 100k'... that's history once you change to the ARP set. Step into today..and leave 63yr old problems in the past.