Have a SBC/SM465/205 in a 73 Blazer with a dropped transfer case. Need to leave it dropped for the driveline angles. The HEI distributor is rubbing against the firewall; I tried to pound alittle space into the firewall....also tried to loosen/remove mounts/crossmembers and shimmy forward toward radiator w/out much success. ....I have *searched on this topic*. Would going to a non-HEI distributor be worth it if it only produced a few inches of space? ....what would the diameter of the non-HEI be? Is there another way that distributor caps latch other than the screw latch to the bottom? Thanks in advance.