Looks like you've got a lot pretty much figured out.
I think you'll just have to change the spool in the barrel valve. All the injection stuff - it's best just to talk to Enderle - they'll give you a good starting point.
You'll get a hundred different opinions on steel vs aluminum rods. Personally I think the aluminum rods are easier on bearings (gives more of a cushion), but I know several guys that are running steel and are not having any problems.
You definately want to o-ring the heads with a receiver groove in the block. If you're running aluminum heads, I'd put the wire in the heads. If you put the receiver in the heads, the aluminum is soft enough it will squoosh around over time and you'll loose the nice crisp receiver groove.
Make sure that you get your valve guide clearanced. I run 3 on the exhaust and 2 on the intake. If you don't loosen them up, you'll gall the stems and we all know what happens then.
As far as blower, If you're just going to make 1500 HP, which on that large an engine will be really easy, you don't need a really fancy blower. You could probably get by with an old used standard helix unit for pretty cheap. I made 1000HP with a 392 hemi running a non-stripped 6-71 turning 15% over.
I've known several people that are running belt driven fuel pumps. The cam drive units just remove another possible failure point.
You'll love the blower. Once you've had one, you'll never go back