Re: cam?
I have ported gt-40 heads, and e-cam, 1.7's and it runs great.
The computer you have may cause problems with the idle after a cam install, definately do some more research, I would suggest a comp cam, because im seeing better numbers and drivability in some of the xre2-?? .544 lift cams, and you can get one specific for using 1.7 rollers.
good luck, and if the heads are off, by all means put a new cam, and timing chain on that thing 
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X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's.
race weight 3,160
12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear
13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear
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