Depends on what your going to do with the boat

Than you Gt

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Right on you will have one bad olds

That sucks but it happens. Have you looked at Mondello Club site

Yes you do but not  a bad idea that way  you Chang the front seal to and check your seal for harmonic balancer

Have you looked at Mondello Web site I believe he set his ring gaps top 20 to 22 and sec is 22 to 24

is the Bassett t valve new or used

Brendella did build jet boat back in the 70 and 80

Powder coating is the way to go I do all of my manifold it depends on how clean the manifold is 160 is about normal

I use to work on the cobra back in the early  90s but if I remember  right Volvo  penta took over the patent in late  90s I think you can get part through  them still

Edelbrock make a nice cam for ford 460 idle to 5500 265 intake and 282 exh and lift is 480 lobe separation 110 and the other cam builder I like is doug herbert cam if you call them tell them what your building they will set up a cam for your motor they have flat tap or you can get a roller cam prices are good to

If you are running log and snails you can't get to crazy on cam size but Doug herbert make some really nice cams I have a solid roller cam in my chevy and love the cam

You want no less the 3 degrees and reasoning for this is deceleration so you dont starve the oil pump