From one SD-er to another, go for the 13.0's on the stock cam! That's really close already. I wish I had done it myself, I got it to 13.26 @ 101.5, all stock except for pullies and exhaust, on some rock-hard Pirelli P500's that were on the pony wheels I bought. I really regret not seriously trying to get there before I pulled it apart and put in the Exploder motor, but you know how 'Stangers are when it comes to mods...
But, if you're going to do it, I'd go with the B-cam as well.
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'88 Vermillion Hatchback
NOT red interior (gray!)
1998 Explorer motor
Speeeeeed Density!
Ported Cobra intake
P heads
P headers
prochamber h-pipe
flowmaster louds
AOD with B&M 2400 converter
5-Speed 3.73's- need Auty 4.10's!!!
RR's, CAI, etc, etc...
Smogless engine bay
Nitto Drag Radials
and... NEW BLACK CARPET!!!
5-Speed ran 12.70's
AOD ran 13.20's
