well like i said, i do have 2 on the stand and both i have built. on is a stock 95 454 the other is a high performance 402 i.e. no stock peanut ports and no dish pistons and definitely no stock cam. the 402 pushed my 79 1/2 tun truck to low 14 sec. times i think it should motivate a 280z just fine and definitely more so then my .030 400 sbc
and if you are interested in the 400, RPMS drop me a line.