I have a 66 289 coupe that smokes real bad when i run it and EXCESSIVELY burns oil and gas (i got about 11mpg and was adding about a quart of oil every 100 miles!!! ) needless to say, it needs engine work. i would like to upgrade to the hi-perf 289. would it be better to have the current (original) engine rebuilt and upgraded to the hi-perf? or would it be better to just buy a whole new engine and have it installed? i live in north FL, about how much should this cost? i got a ballpark estimate from a mechanic that hasn't seen my car and he said about $3000-3500. is this a reasonable price? I am not an experienced mechanic nor do i have the necessary tools to undertake a major task such as this. any feedback is appreciated. thanks!