Two different solenoids - one for each cam - I'm just using one switch for now (msd 8969 is a common approach) at 4600, spins the tires in 1st when it hits the cams. REALLY serious people use two 8969's (or another switch) as the motors build power a bit better when the intake cam switches about 42 and the exhaust 48 or thereabouts depending on the setup (but others argue switching the exhaust first

) The best VE man in America is Andreas Miko; you'll find him here and his signature has his fone #. If you want to get into this give him a call.
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'93 B13, etc.

If you don't have the patience
to do it right the first time,
how is it you have the time to
do it over and over again?