a) The RPM intake (1-1/4" taller than stock) is what you want for a 475 - 500 HP engine. It can be used with a special drop-base shaker aircleaner. Larry Navarro just recently started making and marketing this part do a search on this site to find the info. Forget about the P4B, the stock intakes perform better.
b) #96 heads
c) Currently being manufactured by TUNNELPORT, see the Performance Parts For Sale/Wanted forum.
d) As already mentioned you need to mod the crossmember for a TH400. You'll have to install the converter and see how it performs to know the stall. Better yet get a new one built for your combo from Continental (310) 674-1072. Using an unknown converter won't bring out the best performance and street mannners that you want from your car.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/3.08
2002 WS6 Convertible LS1/4L60E/3.23
1966 VW Type 2 Single Cab Pickup 140hp 2276
1956 VW Type 2 Panel Van 36hp 1200
1957 VW Type 1 Beetle 180hp 2276
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