400 stroker cranks

im going to build a 400/540 this winter,ive asked your question many times and did a lot of research ,even talked to best machine,they said they never attempted to put a 4.5 crank in a 400 block,but I know it can be done but he did tell me to do a few things,is to cut the radius down and use a 6.60 rod,ohio carankshaft ,I see on there website can cut the radius down to 7.4 or 7.3,and do the 2.2 rod journals and the 400 mains size and 6 bolt or 8 bolt.i know theres many crankshaft makers out there,ohio crankshaft,moldex,bryant,callie,scat,velasco,shaftech,kryphonite,crower,so im going to try it,mine with have the radius cut down,8 bolt crank,2.2 rod journals,rod,ie chevy rods,custom pistons,should do good main caps,was told steel main caps for aluminum rods,or aluminum main caps for steel rods,so not sure on my choice of main caps yet,milidon steel caps,or pro gram caps,still in the planning stage and getting everything on paper,opel machine in Chicago will do my machine work if I go with pro gram caps,i will also be going with bushed lifter bores as I run roller cams,when the build starts going ill post,have one block only I will use as a mock up block,as to see where I will grind for rod clearness,as I have 2 other blocks that will get the build,i know truck pullers run the 400 block with big cubic inch