Funny... I had an 87 Astro with an Iron Duke and a T5 years ago... Could have walked faster backward but it was kind of neat! Keep me in mind if/when you decide to cast some of them, I'd be interested in several no matter the configuration.
Will do. I got my clutch pedal and a few other bits for my conversion off an '85 4cylinder/4-speed (Saginaw/Muncie) Astro cargo, so I can understand how they'd be underpowered. The 4.3L and T5 is a fun combo, though.
it seems bizarre to me that they would tool up the 4wd wheels for the S10 , but later do the AWD parts (which are mostly indistinguishable from 4wd parts) for the Syclone. Can't help but wonder if there were some missing memo's on the S10 project back then. We might easily have been having a thread about suitable donor kits for 2wd front suspension instead! 
The Syclone kit was released first, the regular S10 was a bit later. Either way, it's still bizzare that they would have tooled up the wrong wheels for the 2wd.
I'm not sure which "other" tires Monogram would included with the kit, other than maybe the Goodyear GT Radial tires. I don't recall Monogram having any light duty truck tires at that time, other than the Goodyear Tracker A-Ts which had an aggressive tread and would've stuffed the wheel wells full. I think the Monogram's Ford F-series kits used the "bloated" GY Radial GTs which were beyond awful, and even bigger than the Tracker A-T, so no help there.
Lots of potential in this kit for sure. 