Stock short block,440 builds....

Heres one to dwell upon aint put together yet but am planning on it soon dont know that it work or not am sure it'll need some 'tweakin'..have a early 71 440 steel crank shortblk with 8k on rebuild[stock bore etc] cast fact flatops no valve reliefs .040 in the hole,have a fresh set of 906's milled to 77cc ported 2.14-1.81 valves comp springs i think 924's...rpm intake,comp xe solid 290..540-558-252-260..2" fenderwells lupo convert 3.91 or 4.30 gears etc..would like to run pump gas which is 87-91 here...tires are 29.5x15.5x15 mt spt pro..71 dart.. 930cfm dp holley..electronic ignition etc..want it to be streetable and driven legally...yes i know i need to lose some compression so a .060 head gasket will be used,and I can have valve reliefs cut into the pistons for 100bucs but dont know if that will be enough reduction in comp to work on pump gas...may have to change cam to smaller but would rather not, heads are almost closed chamber so I dont know about quench and all...any ideas?