Shoot, if you want a nice 408 build it a put a MP .509 in it, or go crazy and go with the MP .533!

I don't feel like typing so let me agree with Wise. Another advantage to these lobes is they are not fussy. Meaning no noise(as others often have),will rev till the crank falls out without anything special in the valvetrain. The only reasons to spread the lobes is to smooth the power band(take out the hit and hopefully make it easier to hook the tires to the pavement),as well as slightly higher idle vac and reduce the need for a high stall converter. In this case you won't need a high stall converter and traction may be your big problem. Another option is the H10 lobe,4 degrees shorter and a great lobe for a street build. I just finished a mild 360 for a local guy using the H10 lobes on a 108lsa. He was is extremely suprised and the only complaint has be a severe lack of traction,but he's running M/T 275/60-15's. He did almost kill himself doing burn outs but lucky for him he stopped inches short of the trees after clearing a ditch.LOL

Make sure your engine guy knows how it's balanced, internal or external. I just went through this and he doesn't know and I'm having a nightmare with it.

iron heads, port/polish and it has 430ish horse with a dual plane

You need longer dur for these cubes...I have a 250/250* @ .050 mec cam purrrrs like a kitten on the road

Dan