Denton:
Engines, Type 1 ContactS:
Pat Downs at CB Performance: www.cbperformance.com/
Bernie Bergman at 760-747-4649 in Escondido, California
There are also a few type 1 engine builders here on the forum - just ask around (Larry Jowdy comes to mind, but there are other good builders out there).
Type 4 contact: Call Jake Raby at Raby's Aircooled Technology or hit his site at: www.aircooledtechnology.com/Home_Page.htm
As for an East Coast kit, ANY of the major players will give you a terrific car with the kinds of options you want. Two that are within driving distance to see you car under construction and get involved with the build are: Specialty Auto Works with their Subaru-powered Speedster (Like John Hallstrand's car) and Beck Speedsters, out in Ohio.
The biggest things you'll want for ast Coast short seasons are a good fitting top, especially with roll-up windows, and decent heat.
That's about it.