Wondering if anyone has ever used a set of these bmp heads (Bill mitchell products) aka world products. They make a marine head and wondered if anyone had some input on them. I have the chance to purchase 2 sets for a good price. Here's the specs

BMP BBC Aluminum Marine Assembled Head
► 24° Valve Angle
► 310cc Intake Ports
► 119cc Chambers
►Manley 2.300 Severe Duty & 1.880 Inconel Exhausts
► For solid flat tappet or hyd. roller cams w/ 1.550" springs.

I have these heads on my 454's. They have the raised exhaust ports, and quite a few other features that makes them a good bang for the buck.