if every thing would be the same but port size and if your going lower cr then i would be working on the LSA of cam and the cam events and would stay under 550 lift with a flat lifter cam i would start working around a cam of the numbers of about 512 .512 lift with 1.5 rockers a lsa 112 intake center of 108 dur @225/225 off the top of my head and master lobes this sizes i know are not odd to come up with if a custom grind is going to be made .like said about my posted numbers this about were i would start as this cam has a wide power band. it takes me more then a hour or to run threw my soft ware and years of building engines many cams before i am happy i do not pick the cam that sounds nasty but a cam that works. try to get 9to5 would stay under 10.5.1 even with aluminum heads a 185 to 195 cc head if flows good at lower lift .i do not think a 195 is to big of port runner like i said i would work with rpm your going to see and trade off your willing to do if list is short i would have a cam made with my numbers and bouce the off the guy that grinds my cams if needed but there many sbc out there that would fit the bill your asking something thats not so cut and dry the same head 195 with a smaller cam ok less cr .ok but you would need to have a smaller head flow what and valve size ?this would hard to do if the heads need to dyno heads DART as done this if you go on the webpage a smaller cam then what cam hyd solid flat lifter or hyd roller how small .do i think if you have a 350or355 and i build a 383 with lets say one point less cr and a smaller cam or a cam i come up with? i done it most all the time bigger engine will win 1/2 point of cr is less hp then you think