Ok i just bought sold my 90 GT and bought my cousins 67 GT. It has a brand new 289 in it with only 500 miles on it. I wanna swap it out with a 347, but i dont know how worth it it would be. For one, i need to know how much i could get for the 289 if i sold it. And two, i want to turn this into a show car rather than a race car, but i also want some power in it. So some advice would be nice here

