http://www.crankshaftcoalition.com/wiki/Chevy_305_engine
3.736" bore, will go 0.030" over, a 0.060" overbore should be sonic tested according to some machinists
3.48" stroke, same as the 5.7L 350ci and the lame 267 SBC
Rod length is 5.7", same as all SBC engines except the 400
Large journal crank (or medium journal if you consider the 400 to be large journal instead of calling it a 400 journal)
2.100" rod
2.45 main