505 rb build advice needed for 39 dodge

Box stock intake flows as tested from the three heads you have listed.

Lift..........Stealth...........RPM............EZ

.100...........66.................73..............66
.200..........142...............148.............127
.300..........205...............209.............181
.400..........240...............254.............232
.500..........255...............276.............272
.600..........267...............287.............299
.700..........268...............291.............315

Note that the box stock EZ doesn't give any advantage over the box stock RPM until over .500" lift. In fact, the RPM out performs the EZ until that point. Out of the box the RPM or the EZ can do 600 HP with the engine you have described. Do you need 600 HP? No, you probably don't need 300 HP.

It really will depend where you may intend to go in the future. The Indy will give the greatest future power potential as I have never heard of the ported RPMs making anymore than 787 HP on a pump gas 451 ci engine.

I don't like hydraulic cams, just a personal thing, and would go a solid flat tappet or solid roller in the duration and lift (or one step up) you have chosen.

As an idea on what different cams may give you, I have used a hydraulic flat tappet 236/244 at .050 to make 565 HP @ 5300 rpm/629 TQ @ 3500 rpm with RPM heads and a 4.15 stroke. You could certainly use more cam than that if you wished. We've got a 4.15 stroke pump gas 496 on mildly ported RPM heads with a solid roller 249/255 @ .050 .585/.600 lift that makes 642 HP @ 5800 rpm and 642 TQ @ 4600 RPM (600+ TQ 3500-5500 rpm). It is used to haul around a 3900 lb Charger with 3.23 gears and a 4-speed.

The Harland Sharp is a good rocker in my opinion. I have used several sets of PRW stainless steel rockers in street builds to .600" lift. But for the slight difference in the price of the HS rockers in standard offset, I intend to consider the use of Harland Sharps from now on.

If money really isn't a problem and you can afford it, I would consider the Edelbrock Victors and T&D Rockers. The Victor box stock flows are:

.100....68 cfm
.200...141 cfm
.300...204 cfm
.400...246 cfm
.500...277 cfm
.600...305 cfm
.700...324 cfm

You will have to buy locks and retainers, the valve springs you have to get anyway for your cam, and you may have to do some pushrod clearancing. But in the long run the Victor will out perform the EZ head if you port them both.