318 with PS.....What manifolds will fit?
The only thing that will fit with factory power steering (no idea about the Borgeson unit) is the early A 273 manifold, '64-'66.
With the 302 heads (or any later model head with the large exhaust port flange, smog era) you will have interference with the manifold's down leg and the #7 exhaust port. This normally will require you to run a header flange as a spacer between the head and manifold (driver's side only), although some have reported to have gained sufficient clearance with double gaskets. Don't grind the head unless you feel really lucky- there's a coolant passage just under the surface in the area that you'd grind.
There is no port mismatch since the 318 and 273 have the same size ports. No issue running a 273 D.S. and Magnum P.S. manifold if you so choose.
The only thing that will fit with factory power steering (no idea about the Borgeson unit) is the early A 273 manifold, '64-'66.
With the 302 heads (or any later model head with the large exhaust port flange, smog era) you will have interference with the manifold's down leg and the #7 exhaust port. This normally will require you to run a header flange as a spacer between the head and manifold (driver's side only), although some have reported to have gained sufficient clearance with double gaskets. Don't grind the head unless you feel really lucky- there's a coolant passage just under the surface in the area that you'd grind.
There is no port mismatch since the 318 and 273 have the same size ports. No issue running a 273 D.S. and Magnum P.S. manifold if you so choose.