subaru brat engine overhaul

subaru brat
hello, i work @ a public library and have a patron who would like some info on engine dealers who modify engines for a 1985 subaru brat. He is not very computer literate so any 1-800 #'s would be greatly appreciated. He is looking for someone who knows how to enhance the performance of this engine or where he can purchase engines for these models outright already "souped up and RTR" from a company preferably, not an individual if at all possible. thanx for all your suggestions and time in advance.
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