While I'm up here on this soapbox... couple other things to watch out for:
Web site with the bait and switch. You get drawn if for the $5,900 price and then you say you want to add Cobra valve covers, a SCAT crank, aluminum heads, etc. and all this is added in and up... and you're over that other builder's price that included it already, but your on the phone and forgetting that total.
Watch out for the ignition wires. Don't know why
but the better builders always seem to take the time to custom cut/fit ignition wires neatly and don't run'em all over like spaghetti ... and generally don't use yellow wires either
Finally ask to see their dyno and make sure a dyno tune is included and the "warranty" is on paper. A tune is such an effective tool and the only way you know their 400HP special is not a 250HP desktop dyno joker.