Ok gentlemen,

Here are the specs on the build I'm planning. I am for the most part copying a build that was done at FastTimes motor works out of Illinios.

454 seasoned block .030 over with torque plate hone. Cast crank turned 10/10 and spin balanced. Stock rods with beams ground, arp bolts and balanced. TRW L2349 forged pistons with dome (I think this is a repro LS6 piston) Hastings rings.

Now the cam they used (which I have not purchased yet) is a Crower 247/251 @.050 and .579/.594 lift on 112 degrees lobe separation.

Question #1: good choice on cam?

Heads (which I have obtained, but not done a thing with yet) are 781 GM heads with 2.25 intake 1.88 exh Manley Race Flo valves. Mild porting with gasket match to intake and cleaning up ports @the valve. Valve springs with seat and nose pressure of 125 and 330 pounds. 1.7:1 Comp cams roller tip rockers.

Question #2: any suggestions on the heads...Im thinking maybe intake valves are a little too big? Maybe go with 2.19? Or does anyone recommend an after market oval port head that can keep this thing on pump gas (118cc 781's put it at about 10:1 right now)

For a carb they used a Holley 850 cfm double pump (part # hly 4780), and didnt say if is had vaccum or manual secondaries.

Question #3: A little too big of a carb? Vaccuum secondaries I am thinking is the way to go?

Intake manifold they used was a Holley strip Dominator intake Part # hly300-4b.

Question #4: Is this a good manifold for this build? I suspected a dual plane may be more approprite for a car that is mostly street, with the 2-3 times down the track it may take just for kicks?

Finally ignition used is a Mallory comp 9000 & coil Part # Mly 9048201.

Question:#5 Any other recomendations? I have no ignition experience, and all other engine builds I have done have always just used a GM hei unit and rebuilt it with premium parts.

They show a Dyno sheet on this build and it states with 40 degrees timing, 77 and 78 main jets in the primaries and secondaries, it pulled 500 ft.lbs @ 4800 rpm; and 512 hp @ 6200.

Now anybody can print dyno results and I am not experienced enough to know if this is accurate.

I am putting motor in a 66 Chevelle SS that will be mostly street,and occasional strip, but is by no means my daily driver. I was planning on anywhere from a 3.73: to 4.11 rear end 12 bolt running a th400 trans with I am guessing 2500-3000 stall. Any recomendations on this are welcomed.

I beleive this time I gave you guys all pertinant info to make good recomendations and comments. So fire away; of course like most people, I want to produce the most "streetable" power out of this engine, and Im thinking the place to achieve this are the heads.

To you experienced guys out there...your knowledge is invaluable and if you could take the time any recomendations, comments and info from you is very much valued and appretiated.