I dont know if I think any blower could fit honestly. There is 4.25" between the strut bar and stock lower intake manifold. At that plane, there is about 6.5" of clearance between the valvecover hardware. My whipple is 5" tall bare headunit, before any adapting plate. Its about 7" wide at the bottom flange, and about 8" wide at its widest, not including the gear box. But this is also a 1000hp+ blower. I am sure you can go way smaller.
If you removed the lower intake manifold and went straight to the heads with ultra short runners.. you could maybe work out about 2" to 2.5" worth of vertical plenum space and intercooler space, it would be really narrow and small displacement.
Then you still have to get a pulley attached somehow. You cant go through the timing cover opening on the HR/VHR because the water return pipe is there. So you have no choice but to go over the timing cover. Adding the radius of the pulley over the timing cover and offset of the jackshaft combined and the pulley is going to be through the hood no matter how you slice it... Not sure how much, but I would guess at least an inch.
Theres only 2 realistic ways to work it out... 3D scan the engine and a couple potential blower candidates to see if you can make it work at all... or buy a blower or two or three and plop them in there and measure around... but thats risky as you could find yourself 100 hours in before you realize it wont work. The 3D scan method is the only way I would try and tackle it with a PD blower. I feel its just too tight to wing it... but I would never say never.
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