I have 1 5/8" BBK's in with a small bell c4 and they fit with lots of room. The headers went it like cake for me but I had the tranny out at the time and I put them in from the bottom.
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88LX 5.0,C4,3200stall, BBK LT's, Race magnum bullets, K&N, ASP 3" Crank pulley, 3.73's, ram air, air bag, skinnies, battery in the hatch, 75hp NOS Dry Kit, Explorer intake
8.10@84 N/A 1/8th T-5
7.61@89 N2O 1/8th T-5
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