Dont think that cam will create much problems at all.
I like to look at a 318 as a late low compression 340 with smaller ports ,sure that cam is a few degrees larger than the 340 cam but it also has smaller/faster ports.
I do agree however that that combination would benefit from alitle more gear,say some 3.21-3.55:1 or so gears for a driver but its not going to be entirely hopeless.
