thank you to everyone so far for your positive responses and advice, the tank is going to go behind the rear seat, there is enough room there for it, quite an easy mounting job.
as for the mixer issue i have been infornmed here in i might need two, well either way they will be located just inside a sealed compartment in the passenger front upper leg area inside the dash not too much of a loss of space with heater hoses to help do the conversion.
still to work out the carby ideas, real curious on the rumors to use a donut style, similar to what they use on E.F.I cars using duel fuel and a set of throttle bodies, that way i could use maybe duel throttle bodies.
so i guess a little more to decide on the gas set up, but alot to decide on the type of bottom end for the small block before i have to work out the top end.
i have been looking at a late model roller cam block 4 bolt mains and going from there in the terms of rebuild.
so for now has anyone any ideas for gas carbies or donuts style systems
and how does that bottom end idea sound and what are your suggestions
if your interested i will try and work out how to post up some pics of the car so far