I've spent about an hour researching plugs, but still no winner. I need:

Resistor plug
Gasket seat
1 heat range colder than stock
Not sure if I should get "shorty plugs" or not, I haven't seen my wire clearance to the Edelbrock headers.

Anyone have a successful plug with the same setup as me?

 

NGK TR6 (I think) dub check it on prochargers site.

 

That is a tapered fit though. I need a flat gasket seal for my aluminum heads.

 

From the AFR web page.
http://www.airflowresearch.com/sbc_install.php

13) Spark Plugs:
(14mm x 3/4" gasket) no tapered seat style. For race applications Champion C59YC Autolite 3910 or 51, A/C R41 CXLS & NGK R5672A-9 is a good starting point. For street applications use AC FR3LS, AC 41629, or Champion RC9YC spark plugs or equivalent. Plug selection is of course dictated by many factors including rpm level, compression ratio and type of fuel. All the above plugs are a starting heat range, blowers or nitrous application usually 1 to 2 heat ranges colder. Spark plug gap should be determined by the ignition manufacturer.

I run a NGK TR55 in my AFR heads, always have.. I'm thinking if you call AFR they will tell you what you need to know.
I also remember reading some place that the AFRs are cut for both types of spark plugs. I'll check my new instructions that came with my AFR 235 Eliminator heads.

 

From AFR:

1) Spark Plugs:

(14mm x 3/4" gasket) no tapered seat style! For race applications Champion C59YC, Autolite 3910 or 51, A/C R41CXLS & NGK R41 CXLS are good starting points. For street applications use AC FR3LS or RC9YC Spark Plugs or equivalent. Spark Plug selection is of course dictated by many factors including RPM level, compression ratio and type of fuel. All the above Spark Plugs are at a starting heat range; blowers or nitrous applications usually require 1 to 2 heat ranges colder. Spark Plug gap should be determined by the ignition manufacturer.

 

I found one of the colder gasket plugs by NGK, it's a little hard to find, but plenty on Ebay. This looks like a good starting point for aluminum heads/supercharger

NGK V-Power Performance Spark Plugs BKR7E VPOWER # 4644

 

I've been using the Autolite 3923's for years.