ok so the intake is bolted to the exhaust manifold but it also shares the bolts going into the block, pay close attention to these bolts take pics if your unsure i tossed mine in a can and when it came time to bolt it back up it took about 40 min to figure it out lol.
it also shares the gasket on the block you will want to get a new one of those as well. check your services that touch on the intake and exhaust make sure they are not to pitted or rough take a file to them to flatten it out if they are don't take to much though.
Then that way you will know you are not having any leaks from your intake on the block or where it is on the exhaust.
heres a few pics from my 64 that may help.
