I would suggest a Craig equivalent....which is about a TE62, or One from Jack Cotton which will be a Turbonetics unit....Not sure who might sell them closer to home for you but Red A sells Craig's (Limit's) units and usually a bit cheaper than directly from John. He sells injectors as well.
Or call Jack and tell him the price you have received and aske what he can do.
Either way, you won't have to worry about warranty support.
50's will match up very well with that size of turbo but you do need a converter that is 3300-3400 stall.