1) Gasket Match the head to the lower plenum 2) Gasket Match lower plenum to the head 3) Extrude hone the intake plenum 4) Gasket Match the plenum to lower plenum 5) Get bigger throttle bodies from O2inductionBut thats only if you have money to spend on the project. It should cost you around $20 per gasket matching So it would be like for each step 1) $120 to match top of head 2) $240 to do the upper and lower part of the lower plenum 3) $120 to gasket match the upper plenum 4) $350 to extrude hone upper plenum 5) $250 to get the throttle bodies bored out. You add it all up and it comes up to be alot of money :-) And for probably 95% of the people it won't make much of a difference. I am glad you like the retainers I thought they came out great as well.

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