90' lude B21A1

well I got a 90' prelude from a friend (for free) story was he took it to a honda stealership to get a valve replaced and they were trying to charge him $1,600 to do it so he decides he wants to buy a new car instead so he told the stealership to stop work on the motor and they said "well if you want your car back we'll give it to you but you have to pay for the work we already did!" Work includes: removing head so he paid 600 bucks!! Now enter me, the car currently has the head removed and since it is removed naturally i wanted to know if i should rebuild the head or if there's a better head i can throw on that block (I.E. Frankenstien conversion). I wanted some info on the B21A1 i heard bad things like oil leaks and just an overall crapy motor compared to the B20A5. any feed back would be very helpfull oh by the way the previous owner of the car was the original owner has had the car for 14 years and the body and interior are in excellent condition so i will be making this my project car! :feedback: