[84LX89GT]

If you use the 2 barrel cleveland heads, they have 2.03 intake valves and 1.6 exhaust valves and flow pretty well stock, although the exhaust side is a weak spot because the port has a 90* kink in it. The 4 barrel heads are insanely large and i wouldn't use it unless i had a stroker 351W or were using a supercharger to help fill up those ports.

Oh....there are intake manifolds that work on these "clevor" engines and it used to be a more common swap before there was a good selection of cheap aftermarket 5.0L heads, so now you'd be hard pressed to find an offordable intake manifold for it if you can find one. You can buy a much better windsor heads and intake manifold for the price of swapping on cleveland heads and intake manifold.