The electric pumps from 87-up will fit a 1987 sending unit from a TBI pump, some have to be modified, but the EP 241 will fit fine, but it is rated up to about 60lbs. The EP381 is the same factory pump the Grand National and Sy/Ty guys use so it should have enough volume for about 400hp NA.
This is an EP 381 pump with what needs to be modified to work, note one tang is cut off:
This is a side beside comparison of the 241 vs the 381, AFTER I cut the above tangs off:
This is a Walbro 255lph pump on a 1987 sending unit, should be good for about 500hp NA
This is a Walbro 430lph fat bottom pump (E85) on a custom Racetronix mount on a factory sending unit: