Street 390 build, CP pistons with four valve reliefs. I milled the heads to net 10.5 static compression. BBM heads with my "standard" $400 hand port upgrade, RPM manifold with port-match and plenum mods. Holley 830 Annular carb. 232/238 @ .050 on a 12, .580 lift hydraulic roller. Non-adjustable OEM rockers with heavy duty shafts and studs.
The block had been a Jasper engine at some point and had a .040 tag on it. We honed it correctly to .050, drilled up the oil galleys and did normal mods, align hone, deck, etc. No exotics, just attention to details. Here's what she did:
RPM TQ HP
3000 461 266
3500 463 308
4000 497 379
4100 502 392.7
4200 504 402.5
4300 506 415.2
4400 506 423.8
4500 504 432.3
4600 506 442.9
4700 508 454.5
4800 506 461.8
4900 505 470.5
5000 504 479.7
5100 504 489.1
5200 502 497.7
5300 495.9 499.5
5400 489.3 503
5500 484.4 507
5600 481.8 514
5700 479.5 520
5800 473.6 523
5900 467.5 525
6000 462.5 528
6100 457 531
6200 449 529
6300 439 527
6400 430.4 524
6500 423 524
It had the 5325 Morels. No short travel. I wanted to turn it higher just to see the curve over the top, but we were running out of time, and we found peak HP there at 6100. With the non-adj rockers and beehive springs, it never missed a beat at 6500. I suspect it had another 200-300 clean rpm left, because it showed no signs of struggle or fuel curve issues at 6500. I thought the very flat torque band was notable.