Newbie over the pond

Welcome from Texas, give the specs on the drive train.
318, Keith Black 167 pistons, ported 360 heads, lopey cam (unknown specs), long tube headers (again unsure which), GM HEI distributor, edelbrock tunnel ram and dual inline Holley 450s. 4 spd, explorer rear with 3.91. Stock front

I didn’t build it. Was built in the US and found its way to the UK where it resided in another car before being fitted to the Valiant. Likes to rev, no idea on figures.

I am toying with replacing the tunnel ram with the tallest single plane I can fit under the bonnet (hood) and running efi - but I need to gather some info. The headers may also have to go in favour of some decent shorties so I can get some ground clearance. Decisions decisions