There was a BBM on the dyno here last week.
Not a build we contributed to...... just provided the dyno service.

TF heads with their HR springs(PAC 1294), TF HR cam, Howard’s HR lifters(not sure which version), HS 1.5 rockers.

Tthe report I got is things were solid thru 5800rpm, and at 5900 the lifters gave up.

Those heads come set up with the spring installed height at a nominal 1.950”.
The specs for the PAC 1294 are 154@1.950/410@1.350.