i have both a 13b from a 1985 gsl se and a 12a from a 1985 gsl im building the gsl se and i want to have about 500 rwhp which engine whould i use or should i just get a whole new engine and if so what should i get ?

 

Your kidding right?

 

Get a 13B-RE cosmo engine or a 13B-REW for 500hp.A 13Bt will do it with proper tuning.You'll look at about $10,000 if not more for 500hp tho.