The TFSR are good heads. A guy I know is running a 347 w/ TFS R heads with a NOVI 2000 and a crazy custom intake. It just made 680rwhp with 17psi of boost, and the motor isnt broken in or tuned at all yet.
Its going to max at 32psi with a NOVI 3000, and he is looking vor 1100+ RWHP.
Sky
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-1989 Saleen Mustang #406- TFS Heads, E-303, edelbrock intake,70MM TB, 73mm MAF, off road H, headers and 3chamber flows.
12.55@107mph
Going for 11's on 87 octane with A/C and 20+MPG!!!