Well, thinking this way for romping with a little time between... and no OD on the blower.
1. Single IC, no fan..... a couple of good romps and bets are off for not pulling timing.
2. Single IC, fan, no shroud..... make it 3 good romps so to speak.
3. Single IC, fan, shrouded..... make it 4.
4. Double IC, no fan, same as 2... 3 romps.
5. Double IC, fan, no shroud.... same as 3.. 4... maybe 4 1/2.
6. Double IC, fan, shroud, good for maybe 5.
7. FMIC, no fan... same as say 4, maybe at a 3/4.
8. FMIC, puller fan, bit better than 6 perhaps.
9. FMIC, puller and pusher fan, long ways to getting there. Prob is now the amount of draw on the alternator to power all those fans
10. Cut the nose of the SC with FMIC..... BIG time cooling
From what I know of how fans work etc, I bet a single IC with 2 six inch fans all shrouded will be better than a double IC with a single non shrouded 8 inch fan.
Now redesign, how the air comes out of the IC tube to evenly distribute the air through the IC will be better yet.
But the cruncher is... ALL SC's really suck for air flow into the front for any cooling... focus on that problem and I bet a single IC with shrouded fan's can work real sweet....
Just my pathetic opinion