need help choosing 340 cam

71 scamp 3400#s, 10.5 keith black hyper pistons, stock x-heads with dual springs, headers, built 727 with reverse valve body with deep pan, ss springs, mini-tube, frame connectors. 90% drag racing 10% street. no wheels or tires yet. (suggestions)
looking at mp mechanical 284-284-60* valve lift .528" intake and exhaust, centerline 112* (1.5 or 1.6 rockers?)
thanks 340 mopar

P.S. trying to beat brother-in-laws 64 ss nova running low 12s