All of those heads are way wrong for the use. A streetable hydraulic roller/stroker combo with pump gas compression is not going to want to turn more than 62-6500, and will spend it's life mostly at or below 3000 rpm. A 300-315 cfm @ .600 lift head with around a 170 volume will drive away from all that cavernous cnc stuff from 2000-6000 rpm, especially at 5000+ elevation where the car will be used. My advice would be to go smaller, not bigger ports, use the right valve job, and not get caught up in BIG internet flow numbers at the expense of missing the right combo for the job. Great big ports need huge engines, huge cams, and high rpm to work. I just finished a set of BTs that went 335 @ .700 and are just under 170 cc.......and they are going on a 511 cube, drag only engine. The FE port is very short, and cc values are misleading as compared to other stuff.
Torque is king, and toilet bowl-sized ports that "flow" a big number mean nothing in my shop. One might be surprised just how small a port can be as long as it flows well and has high airspeed. A good street head should never be over 170 cc to do the best, and if you put the small heads in the right environment, they will run and make power anyway. I consider 195 cc a HUGE port for an FE. Ports that big should approach 400 cfm, and be on "max effort" mills. Everything I said here is just my opinion based on many FE builds, of many types, over many years.
I flowed a pair of grand canyon heads for a good customer once......380 cfm, 210 cc runners. Flowed good all the way. 820 hp, 600-ish torque. The next year, I replaced those heads with some of mine, 183 cc, flowed 10 less on my bench. Made 75 more hp and about 180 ft-lbs of torque. Same cam, same dyno. Bigger ain't better.
Okay, rant over....sorry, lol.
