I am finally restoring my first car a 69 FB Conv originally a 350/2b and Turbo 350 and trying to decide what engine to use. I have been waiting 33 yrs to do this and the restoration will include a few modern improvements in the suspension area. The drive train will be a 5 or 6 speed and either a modern LS or a 69 400 RA 4 engine I have had for 33 yrs. My main question is are any of you having any luck with pump gas for the higher compression older performance engines?