It is a 3v8-H, if you compare pictures of the 7v8 and 3v8-H side-by-side you will find that the horns on the 3v8-H are slightly farther apart then they are on the 7v8. 3V8-H 7V8-B (wich has the best veiw)
I did compare all three but the 7V8-B has the best veiw.
Proud owner of a 1986 Thunderbeam RSH-10B (Blown) and a 1954 Thunderbolt 1000A. (With 4/5) flickr YouTube