If it's not ported enough that needed welded in several places,you will be no where near 1200 hp.You will have to add couple inches of spacer to plenum to have any volume also.Runners are too long also.Might get 1050 out of it.I have one that has plating welded everywhere to get enough volume.It looks more like sheet metal than cast.Just curious if anyone has experience with Carb Spacers/Shearplates on this flat manifold top.
It is going on a 615, Dart 18 Deg, 2 - 1150's
should be around 1200 hp.
2200 lb T/S
If I need to post more info, just ask. Thanks.