my neighbor has a 88 rx7 turbo is this car worth buying? and is the turbocharged powerplant have the potential to produce serious whp? or is this a dinosaur that i should stay away from?
what about parts availability?

my neighbor has a 88 rx7 turbo is this car worth buying?
depends on how much they want for it and what condition it is in, whether you have the money for maintenance and how many miles are on it

is the turbocharged powerplant have the potential to produce serious whp?
Yes, it has the potential for more rwhp than you need

or is this a dinosaur that i should stay away from?
dinosaur?

what about parts availability?
ebay, junkyards, and plenty of aftermarket for the 7

its something to look into, but learn about the rotary first if you don't know about it already, and we will need more details to help you at all