timing question

i have a 73 340 comp cams 470-270 eddy rpm heads 600 vac holley eddy intake . the question is in order for the engine to run without getting hot ( hotter than normal ) at 20 deg. i have to have initial timing at 30 deg. that seems high to me. it starts fine hot or cold . i do have bounce in the timing when checking it . over all the engine run pretty good . i have not got into the dist yet .thanks