need opinions (quick) on 383 build

[piecesparts]

The ONE THING that is very important in putting a 383 together is the clearancing of the cam and the crankshaft. If you go too nasty on the cam, then you get into the crank's space. I would recommend that you get a good shop to do the lower end, so that they can manage the spacing as they build it. Stand right on to of them and get the experience there.

What have you done with LS-1s? The one that I have came out of a wrecked 2000 Firebird, with a 4l60E tranny. I am working on an install into the 68 Chevy truck with a set of 3.73 gears. I already have the adapter plates for the motor mounts and some of the throttle control cables. I would like to change the cam on this motor before the install is completed, to upgrade the HP a little. I saw a motor in a 64 Belair a few weeks ago that the owner is getting 24 MPG and with a small nitrous shot he was running with his late model Vette.