Brent i wrongly assumed you were using a 6.3 rod and that you were referring to oiling deficiency not a clearance issue. Thats what i get for posting prior to being fully awake. Sorry Brent, no more disruptions on your post.
Thanks Chas for the info (I would like to have an aluminum block

)
I wish there was a
Windsor head that that would flow more in .50 to .70 range. (350 range at .700 would be nice). The engine would like it.