what are u running for exhaust. that 110 lsa cam will have a lil too much overlap for stock exhaust. will revert (suck water thru exhaust at low rpms).

I'm planning on either the Hi-Tek exhaust, or the Barr replacement center rise manifolds from an 86 up Chrysler marine engine with adapters to use Mercruiser risers. If I went that way I'd use some extended stainless risers. I'm a little concerned with the bare 2-3" of pipe on the Hi Tek manifolds but they are the only other option.

While I agree a wider LSA is typically desired, there are other cam specs that come into play. The STOCK cam on a gazillion Merc small blocks and ski boat small blocks came with 109 LSA (GM "395" cam). So just looking at LSA is one factor, but not necessarily the deciding factor regarding reversion.

I know its a little geeky, but I found these valve covers and cant help but think how perfect they are in a Magnum sedan..

http://i184.photobucket.com/albums/x...psc3f65edc.jpg

I had those on my 390 stroker...... keep in mind you can use regular(cheap) small block chevy roller rockers on the magnum heads.... just get the right studs....... I would say you don't need much cam to get 450Hp from a nicely built 408..... 900HP in your boat will be crazy as it is.... I would say keep the cam mild on duration and minimize the reversion chance.......... TBF

I figure if I'm gonna fly the Mopar colors, I better fly them high!! I know its an uphill battle against the Chevy/Mercruiser majority, but I like being the outcast and doing things the hard way. I,m hoping that 900 HP and a raised X will let me at least keep up at some poker runs...

Alright ! keep us posted on your progress!