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Any of the castings (A, B, C, E, G, Ga,) are all good choices. The A, & B may need push rod hole work, but all are great.
Now, if you have none consider this,
$100/200 for a good cores
$100/160 for guides
$160 for seats
$250 valve job
$200 install bigger valves
$180 for valves
$150 for good springs
$1300 so far
plus anywhere from $500 to $1000 for real port work. If you can find some one to port steel heads.
Now you can do port work yourself, but are you really doing it right.
Also you may use the stock valves and whatever size they are. But you may need guides anyway. Consider 30/35 year old valves and heads.
Now E-brock heads are brand new and come with big valves and new springs. Plus they flow better than any of the steel castings. You will have to get a rocker arms. I have used the roller tip rockers from Comp-cams. Get the rocker studs exchanged to 7/16 bottom and 3/8 top and away you go.
To me in the long run the E-brock is the way to go.
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