Will 318, 340 or 360 heads fit on a 273?

My thoughts..........

Don't worry about about changing heads........keep yours, do a good valve job, cut them .030 to reduce chamber volume, put a Performer intake on with a 500 cfm Eddy carb, install a stock 360 Hydraulic cam, try a set of 360 exhaust manifolds........a little wake up not alot of money

BTW, nice van