i have a 1990 200 gt i going to rebuild is the compression in all 6 cyl,s are 70 psi that seams low to me but they are all the same has me stumped it runs good this winter im gonna rebuild it how can i turn it in to a 250 what do i need will the carbs and all that stuff work can i bore stroke it to make something great also what do i do to get lot more compression i wont it to out run my buddys merc lol
