906s will do the trick and the beauty is you can run cheap pump gas. Ring it and bearings, headers intake carb and converter and have fun. If you can find a set of the 67 and earlier closed chamber heads with the big valves even better.
For comparison, in my 55 I put a budget homebuilt 440. Stock 77 440 bottom end, the pistons had never been out of the bores. I changed rod bearings because they were showing copper, changed cam bearings because they were coming apart from years of sitting with the valve springs pressing down on the cam. I used a set of closed chamber iron heads with big valves added and mild port work, no hardened seats or anything, an old Engle HE 3844bl cam with .536, 238 duration intake and .540, 244 duration exhaust. A second hand street dominator intake and holley 750 vs, and a good 8" 5500 stall converter. 3.73 gears in a 4000 lb car, it ran 13.29 with that set up.
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