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I would look at more then flow number for the heads if your trying to stay on a budget you need to look at the springs for lift as well.
With a 305 or 306 cam you are going to need different valve springs, stock springs will bind. You are going to need the spring pockets recut on stock heads. So if you price out the machine work and parts the Edelbrock may be a good price. I spend $1,500 on my heads, LT1's. milled, reshaped, porting, bigger valves, springs, titanium retainers, sur-locks etc.
I think the LSa is too tight on a 306 to pass a sniffer. Maybe with a 114/115 LSA it could go thru, but why bother as that will just kill the top end.
I've seen Hotcams + heads pull 325 RWHP, I'd expect the 305 to be slightly better.
With the above heads, Mac shorties and 52MM TB using a smaller Lingenfelter 211/219 cam I pulled 317 HP and 336 torque on the dyno.
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93Z M6 Black: The 385 Lives! Supercharged, 3-core front mount intercooler, GTP heads, 3:73's, Street twin clutch, Jethot Longtubes, Mufflex 4" catback/spintech, S+W cage, Spohn Suspenion, Yada Yada Yada
1) Build it
2) Race it
3) Break it
4) Repeat!!!
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