let/eurocharged makes a h/e as does needswings. im not sure if the needswings will work email them to find out.
code 3 also makes a h/e but they are having some serious customer service issues, you may want to wait to see if they survive the fallout
by using the videos a custom unit can be made easily with some measurements and a competent welder

the h/e used by woody is summit racing part number sum380645

also the separation of the i/c and the engine fluids is not mandatory. with the new h/e and cm30 installed with the factory plumbing you will still see reduced temps