You dare to bring this back on topic............. 
OK - Yes the AFR195 has greater flow than the LS1 head. I do like them very much. Now I selected the 205 (same cost same flow though bigger ports) for this mental exercise because of the velocity. Yes it is good to have velocity in the ports and yes it is the excuse most often used to not use a bigger head. The one thing people do not say is ..... it has to much velocity hence will have sonic choke. You want to have velocity between 270 and 300 fps at peek HP. Anything over 300fps is going to be to fast.
So 347 at 7000 rpm (500+ hp) if it used the AFR195 head the port speed will be 354 fps. Way to fast.
The 205 is not really big enough either though cost starts to play a point in the decision process.
i was figuring around a 6300 rpm engine for the guy guessing that his 500 hp number was not cast in stone and was instead more something he heard was good.
as far as choke in the ports goes, joe shermam made 530 hp at 7000 rpm with very mildly ported 185 afr heads on a 347 and they will choke sooner than the 195's but its hard to know exactly what he did to them unless i call him.
numerous people made over 500 with the 195's on a 408, and fitzy made over 500 on his 363 with the pro port 195's and a 232 @ .050 solid cam . the cam i had him get makes even more and has more power everywhere according to his butt dyno.
if the op used the afr 195's and the same cam i had fitzy get, it will still have decent bottom end if he puts at least 3.73 gears in it . if he wants to street race, he could use 3.91 in a 9" and it would haul friggen ass, so imo, who cares about hp numbers if the car is scary anyway.
if he wanted big power and lots of top end i would certainly use the 205's and maybe thats what he wants . i just know from dealing with the public on a nearly daily basis, that what they say they want is more often than not WAY more than what they really want.
i cant even count the times i have had someone tell me they wanted a 500 hp engine for example so i take them for a ride in a car that has only 450 hp and they say it is too fast, lol.
.
