I have Brabham BT21C with a Hewland 4-speed MK 8 gearbox with a Torsen Diff and 9:31 CWP. It was used for SOLO II competition so it is geared very low. I have a Brian Hart twincam that will be going to Ted Wenz in a couple weeks that should be a strong engine. I would like to upgrade to MK5 gears. I know I need a new 1.125" layshaft and the gears but don't know what else is needed. I'm assuming at this time that the forks and bearings are all good. Could someone provide me with a parts list and maybe some recommended gear ratios to at least get me around a track reasonably well. Thanks for the help. Its been over 40 years since this car has seen a track.