The Roush pump is the same Bosch pump (4 gpm under load with the usual small hoses and restrictions, draws 4A) as used in the 07-12 GT-500 cars. In theory, a small IC will work, provided you increase the flow rate through it, to increase heat extraction. (100% distilled water + water wetter will also increase heat extraction inside the IC). But the extracted heat has to then be transferred to the air.... via the HE. Unless the HE is bigger, a larger pump might not buy you much, if any. But that 13/14 GT-500 HE is huge, at 3.125" thick...and then you can really take advantage of the higher flow rate pump. Hood vents may well enhance airflow through the myriad of rads a bit. So would leaving the eng fan on high speed. (put defrost on, set temp control to anywhere you want, cabin fan to lowest setting, and the eng fan will default to high speed. Or put AC on, with air coming out anywhere, same deal, eng fan defaults to high speed).
I assume you are using Chevron 94 (no ethanol in it) being in Vancouver. 8 of us here across the pond in Victoria have had clogged fuel pump socks...and we all use chev 94. Mine was the latest fiasco. One day the car would not go into boost, it would gag, with boost gauge just a hair to the left of zero. My FPDC was sky high, like 96%, just prior to the sock issue. Installed the 10 gauge wire mod..and it made zero difference...then got worse, like 98%. 2 weeks later it gagged. Cleaned the sock out, and FPDC dropped to 80% @ 6 krpm. ( 36% @ idle). You should see the crap floating about the bottom of the tank. I put in a call to the plant manager at their refinery in Burnaby.
