my rad is being specially made, not done yet because it is not in this phase of the build.
fits side to side using existing mounts and will have the water in and out to suit the engine. have seen one on larry horn's safari car featured in the club mag a few months ago .... SERIOUSLY well made radiator, great cooling. Quoted at £495 including pair or electric fans.
another mod that will make a vast difference is venting the inner wings to allow the hot air from the high pressure area under the bonnet into the low pressure area behind the wheels.
merely venting the bonnet will not always work unless it is done right because the area at the bottom of the screen is under pressure and therefore does not let the hot air escape cleanly
the most commonly used ally rad comes from the camaro - pretty good, used by the majority of sbc conversions, had a new one but sold it to zeeman (still have to deliver it) they are about £100ish. You can get top and bottom support brackets for it from JTR or if you fancy fabricating a set still have the ones I have sold to zeeman. Am sure steve would not mind me taking photos and dimensions for you.
spoke to rob at laurence's - if you say that you need the column they will dig it out for you.