How hard can a 273,run? (street/strip)?

If you use the 66-67 273 heads it wont change the comp raito at all & opens the door for intake manifolds! & yes that cam will work in there. my dads 273 in his old belvedere used a small crower solid cam that was close to stock 340 specs. you will need @ least a true 2500 stall to work correctly if not a little more. Also if anyone has seen or head of this 67 belvedere (above) please let me know! it would floor him to know its whereabouts! last known in southeast Ne. mid 80's