Originally Posted by Adam331Fastback
Ok yeah on that windsor i just a race main support, but a valley girdle i dont have? Do i need it you think? Nd on the boss 302 do i need special cam bearings nd special head gaskets?
Do you need it? Well yes, no, maybe. It does strengthen and tie together the top of the block so I can definitely see where it would be beneficial. Look up "Valley Girdle Pro" to see it for yourself.
I don't think the Boss 302 block requires any special bearings or gaskets unless they have a tall deck version. As long as you stay with the short deck version like the stock 5.0 block I believe you will be ok.
One thing I would do if building a new engine is to have the bottom of the heads and the block deck surfaced to specs for the MLS gaskets. They work really good, but require a special machined finish to work properly. You can find the specs on the Cometic website. I believe it is a 50 RA finish, but check that to be sure.