Good to see a fellow Kentish man on this thread!
Find the right 318 block and bore it to 4.040 and put all the nice 340 parts in!
Plus you can use the 340/360 heads with the bigger bore...:thumbsup:
I did a a plus 110 overbore 318, with turned down 340 pistons myself.
Think its 333 cubes but 'just a poorman's 340' lol.
Poly John from Kent UK