I've got a Pavtek engine sitting under the bonnet of my XB. I can't say a bad word about them (Mick and Theo). They are good at what they do and fast to boot. None of this BS taking months and months to sort an engine. My engine was around 4-5 weeks start to finish inc engine dynoing. I made 588hp @ 7200rpm and 500ftlbs torque with 393ci and 218cc 3V's. Ran 11.11's off the trailer on the best part of a 30deg day, with a 7 day old engine. You may have seen pics of my car and the write up in Performance Ford Magazine.
A 351 done by another company I had done took 4 months.
What are you buying from them? A complete engine? I personally would by the heads direct from CHI (http://www.chiheads.com
). Probably saves you some $? Then just purchase a short motor from Pavtek.
My cars no drag car either. It runs normal shockers/springs not drag shocks or springs. No traction assistance like Caltracs or the likes. Basically I can drive the car to the strip, swap tyres race, swap tyres and drive home.