I've got the Mac 1 5/8 long tube headers on my blown 87GT.I'm very happy with them.Shorties in my opinion are a waste of money.Long tubes produce more power and torque.
Changing spark plugs is easy with the long tubes.I've changed mine in about a 30-40 minutes
I had to unbolt the motor mounts,then jack the motor up so I could slide the headers on up through to the heads.After they were fitted,I tightened them up to the Mac H-pipe and loved them ever since..
Go for it!
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Paxton Blown 87GT