Here’s my answer to your flow numbers.......
Heads flow 220...... net valve lift is .420”
Has gone 10.40’s.
Played with a 350 Pontiac combo in it for a bit this year. Same .420” lift, but the small valve 350 heads only flow 200.
The 350 has been 10.80@123.
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Valve lift in mild street builds is highly over rated imo.