IF you're using a tall deck 427 block, then you're very limited on intake choices. You could try to call Summit Racing and see what's available, if anything. (800-230-3030).
The big advantage to the tall deck 427 is that you can improve your rod/stroke ratio by using longer rods. The 427 already has a decent 1.63 rod/stroke ratio and is an excellent revving big block. You can improve that with longer rods to make it rev like a 302 Z28 motor. Drag racers sometimes liked building 427's like that, so they could take advantage of the big hairy solid cams to allow the higher rpms. If you do that, then little 366 heads are probably the last thing you'd want to use. You'd probably want either rectangle port heads or large oval port heads. You'll almost have to use a custom sheetmetal intake in a single plane configuration with a big Dominator on top. I hope you're drag racing and not street driving, with this configuration, because you wouldn't be happy on the street with a 4000-8000 rpm band.
If you want torque, you don't need the tall deck 427! You already have a good motor that revs well and makes good torque in the normal-deck 427. Plus parts are a lot more plentiful. Off-the-shelf pushrods and intakes, for a start. With a good set of bowl-blended oval port heads with large valves, you'll easily get 7000 rpm out of them. I know from experience. And you'll out-power rectangle port heads all day long in total average torque and power. The rect. port heads only make better power above 7000 rpm.
In fact, I'm pretty sure that you can stroke a 427 with a 454 crank and boost the torque even higher, and still comfortably get 6000 rpm out of it with good quality parts.
What exactly is your goal with this engine...let's start there.
