Motor is seated and ready for it first 1/8 mile stomp

Jetted my carb up 6 steps, when to our local track(1/8 mile) and did some 2nt gears stomps to get heat in the plug and check fuel

Still need a little bit more fuel but timing is still to high. Took the color from the ground strap all the way to the weld on the base of the plug.(NGK 3930)

Took 2 more degrees out of it and did several more 2nt gear stomp with a new plug.

The burn mark stops just above the weld....... at this point my Total Timing is at 28*?????

408 12.75 compression,RHS heads, Low end designed Hyd Roller, 2800 stall, 456 gears

My best et with the 340 was 9.57( remember this is at a 6500 foot elevation track!)
First run out of the box netted me a 8.31 and my 60s are now 1.9s to 1.88 in stead of the 2.2s of before.
Our adj altitude started out today at 8500 feet and climbed to 9540 by the end of the day. this is actually good air for this track.

A couple other notes, ran a 25/75 mix of 91 pump gas and 112 racing fuel. 112 because it was what i had available to me at the time.
For the most part dead hooking, so I'm happy with my new slicks!!!

At only 28* total timing my initial is only around 10 and its not happy at idle. by 2000 rpm my advance is all in so just a little throttle and it sounds a lot better.

Do i just need to put a colder plug in it and advance the timing or do these rhs heads(quench designed head) only need 28* of timing?????