need advice on some heads

I am going through this same type of head choice right now, TD. The EQ magnum heads are the most attractive as well as the RHS equivalents for iron, and Edlebrock has a magnum Al equivalent. I am focused on good CR for low end torque so the smaller chambers are needed.

Looking at the stock EQ Magnum flow numbers with the standard 1.92" intakes, the flow numbers are very close to stock 351C-2V heads from the early 70's. (Low 200 cfm range at .4 and .5 valve lift.) Those 351C-2V heads flowed very well for stock heads 40+ years ago, and would IMO be all you need for a none race, street car, based on my direct experience with them 'back in the day'. From what I can find so far, the 1.88 valves in the 360 heads are pretty decent but not as good as the stock EQ heads if not ported. And the Magnum chambers are smaller so the compression is higher; with a cam like yours, that may make a positive difference in driveability.

AS I UNDERSTAND IT TODAY (OTHERS PLEASE CORRECT ME): Putting on Magnum heads is a lot more than just the heads. You can get the EQ's bare for a bit over $300 each from Summit. But then you need to add valves and springs, and stud mount rockers because the Magnum heads do not use the old Mopar rocker shaft rocker system. The lifters have to be AMC types, and the pushrods are different to provide the oiling for the stud rockers and valves up through the pushrods, not through block/head passages and into the rocker shafts like the standard SBM design. The pushrods are also a different length. All of this has been boiled into a 'recipe' but you're changing a lot of parts all at once. (If you have lifters with that new cam, they will have to be changed.)

BTW, you CAN buy the EQ magnums drilled for the LA intakes so you would not have to change your intake out.

For roughly the same CR as the magnums, the other alternative is to get some swirl port 318 heads (302 heads) or even late 273/early 318 heads (675 casting) and have 1.88 valves put in them. But it looks like they can't flow into the low 200 cfm range @.4 or .5 lift without a fair amount of porting, like the the newer casting magnum heads do out of the box. So there is cost in that work. The 'out of the box' flow numbers I cited above are why the performance cast magnum heads (EQ, RHS, Edlebrock) are attractive to me: no big deal to get very good flow for street performance with good CR with flat top pistons. But you gotta make that leap to a whole different valve train for the magnum heads.

BTW, I have focused in on one step lower XE cam, the 262. I like low end and mid range. IMO, just don't get too caught up in the max flow numbers if you are not drag rading: it sound like the 300+ HP range would be where you are going, not the 450+HP range.

I have not looked at the Edelbrock non-magnum aluminums. Sounds like the heads cost a good bit more if it is $1500 for a pair. I'll check them out for completeness.....