Early A body. SB with Lakewood

I'm about to put a 4-speed in my '65 Valiant, and seeing as I will be racing it, I'm not even considering using a stock housing. I guess I'll have to pound a little on the body to clear that Lakewood... unless I cut the tunel out and replace it with a larger tunnel from a later car?? It's either that or a race-built 904.