I have a 421 +4 stroker cub, it seems the bottom end is not there i'm running 35mms strikers with 150 mains, if I get the adj timing plate and go +4 think it will help? I have a '00, it sat for 4 yrs and just got back into riding bout 6 months ago and just put 8,000 in this bike, just trying to build it to its full potential.