I really like how their clutch pedal setup looks, but I built my own when I did my T5 swap a few years ago. I ended up using the F-Body pedal setup for external hydraulic clutch cylinder. I had to fabricate some supports for the firewall, but it was pretty easy.
I recently went to a TKX, from American Powertrain, for my 85 SS using the T5/700r4 crossmember from Summit I already had, I used a fitting to convert to a Hydraulic throw out bearing. The trans fits in super well, plenty of space all around. I used these headers from Summit:
https://www.summitracing.com/parts/hed-68310, but I really should've went with some ceramic coated ones, which would be these:
https://www.summitracing.com/parts/hed-68313.