I dealt with AFM about 4 years ago when I purchased my GT-40 intake, 155lph fuel pump, 24lbs injectors and adjustable fuel pressure regulator from them. Rick was great and I had no problems with the order.
I would recommend the dyno tune. It is something I still haven't done but think that it is money well spent - especially if you are "done" with the car (at least for a little while).
Given your 347 stroker motor, you will probably benefit greatly. And at least this way you will have some peace of mind that the A/F ratio is stable throughout the rpm range.
Good luck,
E
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1991 5.0 LX Coupe - 38,000 miles
13.17 @ 106.14 mph w/ 2.138 60'
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